He'd simply smoke so much so fast that it would be so unpleasant and the memory of it so repulsive that once he'd consumed it and gotten it out of his home and his life as quickly as possible he would never want to do it again. He would make it his business to create a really bad set of debauched associations with the stuff in his memory. The dope scared him. It made him afraid. It wasn't that he was afraid of the dope, it was that smoking it made him afraid of everything else. It had long since stopped being a release or relief or fun. This last time, he would smoke the whole 200 grams—120 grams cleaned, destemmed — in four days, over an ounce a day, all in tight heavy economical one-hitters off a quality virgin bong, an incredible, insane amount per day, he'd make it a mission, treating it like a penance and behavior-modification regimen all at once, he'd smoke his way through thirty high-grade grams a day, starting the moment he woke up and used ice water to detach his tongue from the roof of his mouth and took an antacid — averaging out to 200 or 300 heavy bong-hits per day, an insane and deliberately unpleasant amount, and he'd make it a mission to smoke it continuously, even though if the marijuana was as good as the woman claimed he'd do five hits and then not want to take the trouble to load and one-hit any more for at least an hour. But he would force himself to do it anyway. He would smoke it all even if he didn't want it. Even if it started to make him dizzy and ill. He would use discipline and persistence and will and make the whole experience so unpleasant, so debased and debauched and unpleasant, that his behavior would be henceforward modified, he'd never even want to do it again because the memory of the insane four days to come would be so firmly, terribly emblazoned in his memory. He'd cure himself by excess.
This is a beautiful, dramatic, well-written, and terrible plan. I love it.